docs: update spec and guide for search position and chevron removal

- COMPONENT_GUIDE: note search renders between Header and Sections,
  no chevrons on section headers
- Spec: update rendering diagrams and description to match
  implemented behavior

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

COMPONENT_GUIDE.md

@@ -114,8 +114,11 @@ Sidebar compound API:
     </Sidebar.Footer>
   </Sidebar>
 
-The app controls all content — sections, order, tree data, collapse state.
+Notes:
-Sidebar provides the frame, search input, and icon-rail collapse mode.
+- Search input auto-renders between Header and first Section (not above Header)
+- Section headers have no chevron — the entire row is clickable to toggle
+- The app controls all content — sections, order, tree data, collapse state
+- Sidebar provides the frame, search input, and icon-rail collapse mode
 ```
 
 ### Data page pattern

docs/superpowers/specs/2026-04-02-composable-sidebar-design.md

@@ -73,6 +73,7 @@ The outer shell. Renders the sidebar frame with an optional search input and col
 - Width transition: `transition: width 200ms ease`
 - Collapse toggle button (`<<` / `>>` chevron) in top-right corner
 - Search input hidden when collapsed
+- Search input auto-positioned between `Sidebar.Header` and first `Sidebar.Section` (not above Header)
 
 ### `<Sidebar.Header>`
 
@@ -119,13 +120,13 @@ An accordion section with a collapsible header and content area.
 
 **Expanded rendering:**
 ```
-v [icon] APPLICATIONS
+[icon] APPLICATIONS
   (children rendered here)
 ```
 
 **Collapsed rendering:**
 ```
-> [icon] APPLICATIONS
+[icon] APPLICATIONS
 ```
 
 **In sidebar icon-rail mode:**
@@ -133,7 +134,7 @@ v [icon] APPLICATIONS
 [icon]     <- centered, tooltip shows label on hover
 ```
 
-Header has: chevron (left), icon, label. Chevron rotates on collapse/expand. Active section gets the amber left-border accent (existing pattern). Clicking the header calls `onToggle`.
+Header has: icon and label (no chevron — the entire row is clickable). Active section gets the amber left-border accent (existing pattern). Clicking anywhere on the header row calls `onToggle`.
 
 **Implementation detail:** `Sidebar.Section` and `Sidebar.Header` need to know the parent's `collapsed` state to switch between expanded and icon-rail rendering. The `<Sidebar>` component provides `collapsed` and `onCollapseToggle` via React context (`SidebarContext`). Sub-components read from context — no prop drilling needed.
 

src/design-system/layout/Sidebar/Sidebar.tsx

@@ -1,11 +1,9 @@
-import { type ReactNode } from 'react'
+import { type ReactNode, Children, isValidElement } from 'react'
 import {
   Search,
   X,
   ChevronsLeft,
   ChevronsRight,
-  ChevronRight,
-  ChevronDown,
 } from 'lucide-react'
 import styles from './Sidebar.module.css'
 import { SidebarContext, useSidebarContext } from './SidebarContext'
@@ -124,9 +122,6 @@ function SidebarSection({
         aria-label={open ? `Collapse ${label}` : `Expand ${label}`}
         onKeyDown={(e) => { if (e.key === 'Enter' || e.key === ' ') { e.preventDefault(); onToggle() } }}
       >
-        <span className={styles.treeSectionChevronBtn} aria-hidden="true">
-          {open ? <ChevronDown size={12} /> : <ChevronRight size={12} />}
-        </span>
         {icon && <span className={styles.sectionIcon}>{icon}</span>}
         <span className={styles.treeSectionLabel}>{label}</span>
       </div>
@@ -199,7 +194,20 @@ function SidebarRoot({
           </button>
         )}
 
-        {/* Search (only when expanded and handler provided) */}
+        {/* Render Header first, then search, then remaining children */}
+        {(() => {
+          const childArray = Children.toArray(children)
+          const headerIdx = childArray.findIndex(
+            (child) => isValidElement(child) && child.type === SidebarHeader,
+          )
+          const header = headerIdx >= 0 ? childArray[headerIdx] : null
+          const rest = headerIdx >= 0
+            ? [...childArray.slice(0, headerIdx), ...childArray.slice(headerIdx + 1)]
+            : childArray
+
+          return (
+            <>
+              {header}
               {onSearchChange && !collapsed && (
                 <div className={styles.searchWrap}>
                   <div className={styles.searchInner}>
@@ -226,8 +234,10 @@ function SidebarRoot({
                   </div>
                 </div>
               )}
-
+              {rest}
-        {children}
+            </>
+          )
+        })()}
       </aside>
     </SidebarContext.Provider>
   )